Anytime you have metal in contact with seawater or fresh water you will have corrosion. By installing and MAINTAINING sacrificial anodes on your vessel, boat lift, retaining wall or fresh-water storage tank, the “sacrificial anodes” are consumed in the corrosion process instead of the metals protected by the sacrificial anodes.
This is why manufacturers install calculated sacrificial anodes
(usually zinc, but also aluminum, as well as magnesium for strict freshwater use) on new watercraft (boats, ships, barges, even jet skis).
However, over time the sacrificial anodes are consumed and need to be replaced (usually calculated for once a year).
Additionally, on many boats and vessels, the sacrificial anodes are used in a “bonding” system so that interior wires “electrically” connect underwater metals (i.e. through-hull fittings, propellor
shafts, engines). This provides corrosion protection to exposed metals to which it is not practical to attach individual sacrificial anodes.
Over time, these electrical connections can deteriorate or break and the sacrificial anodes can be consumed or damaged, leaving exposed metals unprotected.
Pre-Purchase Corrosion Surveys and scheduled Corrosion Surveys are an extremely important aspect of acquiring and maintaining any vessel, whether tankers freighters , superyachts , or smaller recreational vessels.
Unprotected metals can corrode very quickly, causing leaks (through-hull fittings), reduction in performance (propellors) and even breakdowns (propellor shafts and supports). All of these problems can result in vessel downtime and expensive repairs.
Marine Surveyors Cayman has the capabilities and experience to conduct corrosion surveys to determine if your boat or other asset has sufficient “cathodic protection” with functioning “sacrificial anodes”.
Marine Surveyors Cayman also conduct tests to verify that your vessel’s electrical circuits are functioning correctly and not interfering with the corrosion protection of the sacrificial anodes.